feat: add gateway billing estimate and rate limit details

apps/web/src/pages/admin/IdentityManagementPanels.tsx

@@ -78,8 +78,10 @@ type UserGroupForm = {
   description: string;
   source: string;
   priority: string;
-  rechargeDiscountPolicyJson: string;
-  billingDiscountPolicyJson: string;
+  rechargeDiscountFactor: string;
+  rechargeDiscountPolicy: Record<string, unknown>;
+  billingDiscountFactor: string;
+  billingDiscountPolicy: Record<string, unknown>;
   rateLimitPolicyJson: string;
   quotaPolicyJson: string;
   metadataJson: string;
@@ -516,8 +518,8 @@ export function UserGroupsPanel(props: IdentityPanelProps) {
         <Label>状态<Select size="sm" value={form.status} onChange={(event) => setForm({ ...form, status: event.target.value })}>{userGroupStatuses.map(option)}</Select></Label>
         <Label>优先级<Input size="sm" value={form.priority} inputMode="numeric" onChange={(event) => setForm({ ...form, priority: event.target.value })} /></Label>
         <Label className="spanTwo">描述<Input size="sm" value={form.description} onChange={(event) => setForm({ ...form, description: event.target.value })} /></Label>
-        <JsonField label="充值折扣策略 JSON" value={form.rechargeDiscountPolicyJson} onChange={(value) => setForm({ ...form, rechargeDiscountPolicyJson: value })} />
-        <JsonField label="计费折扣策略 JSON" value={form.billingDiscountPolicyJson} onChange={(value) => setForm({ ...form, billingDiscountPolicyJson: value })} />
+        <Label>充值折扣系数<Input size="sm" value={form.rechargeDiscountFactor} inputMode="decimal" placeholder="1 = 不打折，0.95 = 95 折" onChange={(event) => setForm({ ...form, rechargeDiscountFactor: event.target.value })} /></Label>
+        <Label>计费折扣系数<Input size="sm" value={form.billingDiscountFactor} inputMode="decimal" placeholder="1 = 不打折，0.95 = 95 折" onChange={(event) => setForm({ ...form, billingDiscountFactor: event.target.value })} /></Label>
         <JsonField label="限流策略 JSON" value={form.rateLimitPolicyJson} onChange={(value) => setForm({ ...form, rateLimitPolicyJson: value })} />
         <JsonField label="额度策略 JSON" value={form.quotaPolicyJson} onChange={(value) => setForm({ ...form, quotaPolicyJson: value })} />
         <JsonField label="元数据 JSON" value={form.metadataJson} onChange={(value) => setForm({ ...form, metadataJson: value })} />
@@ -769,8 +771,10 @@ function defaultUserGroupForm(): UserGroupForm {
     description: '',
     source: 'gateway',
     priority: '100',
-    rechargeDiscountPolicyJson: '{}',
-    billingDiscountPolicyJson: '{}',
+    rechargeDiscountFactor: '1',
+    rechargeDiscountPolicy: {},
+    billingDiscountFactor: '1',
+    billingDiscountPolicy: {},
     rateLimitPolicyJson: '{"rules":[]}',
     quotaPolicyJson: '{}',
     metadataJson: '{}',
@@ -785,8 +789,10 @@ function userGroupToForm(group: UserGroup): UserGroupForm {
     description: group.description ?? '',
     source: group.source,
     priority: String(group.priority),
-    rechargeDiscountPolicyJson: stringifyJson(group.rechargeDiscountPolicy),
-    billingDiscountPolicyJson: stringifyJson(group.billingDiscountPolicy),
+    rechargeDiscountFactor: discountFactorText(group.rechargeDiscountPolicy),
+    rechargeDiscountPolicy: group.rechargeDiscountPolicy ?? {},
+    billingDiscountFactor: discountFactorText(group.billingDiscountPolicy),
+    billingDiscountPolicy: group.billingDiscountPolicy ?? {},
     rateLimitPolicyJson: stringifyJson(group.rateLimitPolicy),
     quotaPolicyJson: stringifyJson(group.quotaPolicy),
     metadataJson: stringifyJson(group.metadata),
@@ -801,8 +807,8 @@ function formToUserGroupPayload(form: UserGroupForm): UserGroupUpsertRequest {
     description: form.description.trim() || undefined,
     source: form.source,
     priority: Number(form.priority) || 100,
-    rechargeDiscountPolicy: parseJsonObject(form.rechargeDiscountPolicyJson, '充值折扣策略 JSON'),
-    billingDiscountPolicy: parseJsonObject(form.billingDiscountPolicyJson, '计费折扣策略 JSON'),
+    rechargeDiscountPolicy: discountPolicyPayload(form.rechargeDiscountPolicy, form.rechargeDiscountFactor, '充值折扣系数'),
+    billingDiscountPolicy: discountPolicyPayload(form.billingDiscountPolicy, form.billingDiscountFactor, '计费折扣系数'),
     rateLimitPolicy: parseJsonObject(form.rateLimitPolicyJson, '限流策略 JSON'),
     quotaPolicy: parseJsonObject(form.quotaPolicyJson, '额度策略 JSON'),
     metadata: parseJsonObject(form.metadataJson, '元数据 JSON'),
@@ -854,14 +860,57 @@ function newIdempotencyKey() {
 }
 
 function discountSummary(group: UserGroup) {
-  const billing = group.billingDiscountPolicy?.discountFactor ?? group.billingDiscountPolicy?.factor;
-  const recharge = group.rechargeDiscountPolicy?.discountFactor ?? group.rechargeDiscountPolicy?.factor;
+  const billing = discountFactorFromPolicy(group.billingDiscountPolicy);
+  const recharge = discountFactorFromPolicy(group.rechargeDiscountPolicy);
   const parts = [];
-  if (billing) parts.push(`计费 ${billing}`);
-  if (recharge) parts.push(`充值 ${recharge}`);
+  if (billing) parts.push(`计费 ${trimNumber(billing)}`);
+  if (recharge) parts.push(`充值 ${trimNumber(recharge)}`);
   return parts.join(' / ') || '未设置';
 }
 
+function discountFactorText(policy?: Record<string, unknown>) {
+  const value = discountFactorFromPolicy(policy);
+  return value ? trimNumber(value) : '1';
+}
+
+function discountFactorFromPolicy(policy?: Record<string, unknown>) {
+  return numberFromUnknown(policy?.discountFactor) ?? numberFromUnknown(policy?.factor);
+}
+
+function discountPolicyPayload(basePolicy: Record<string, unknown>, discountText: string, label: string) {
+  const policy = { ...basePolicy };
+  delete policy.discountFactor;
+  delete policy.factor;
+  const discount = optionalPositiveNumber(discountText, label);
+  if (discount && discount !== 1) {
+    policy.discountFactor = discount;
+  }
+  return Object.keys(policy).length ? policy : undefined;
+}
+
+function optionalPositiveNumber(value: string, label: string) {
+  const text = value.trim();
+  if (!text) return undefined;
+  const parsed = Number(text);
+  if (!Number.isFinite(parsed) || parsed <= 0) {
+    throw new Error(`${label} 必须是大于 0 的数字`);
+  }
+  return parsed;
+}
+
+function numberFromUnknown(value: unknown) {
+  if (typeof value === 'number' && Number.isFinite(value) && value > 0) return value;
+  if (typeof value === 'string' && value.trim()) {
+    const parsed = Number(value);
+    if (Number.isFinite(parsed) && parsed > 0) return parsed;
+  }
+  return undefined;
+}
+
+function trimNumber(value: number) {
+  return value.toFixed(6).replace(/\.?0+$/, '');
+}
+
 function policyKeys(value?: Record<string, unknown>) {
   if (!value) return [];
   return Object.keys(value).slice(0, 3);